# 使用'setdefault'方法
vowels = {'a','e','i','o','u'}
word = input("Provide a word to search for vowels:")
found = {}

for letter in word:
    if letter in vowels:
        found.setdefault(letter,0)
        found[letter] +=1
for k,v in sorted(found.items()):
    print(k,'was found',v,'time(s).')

# 运行结果
# Provide a word to search for vowels:yrosl
# o was found 1 time(s).